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-rw-r--r--m4/posix_spawn.m4691
1 files changed, 691 insertions, 0 deletions
diff --git a/m4/posix_spawn.m4 b/m4/posix_spawn.m4
new file mode 100644
index 0000000..86143b6
--- /dev/null
+++ b/m4/posix_spawn.m4
@@ -0,0 +1,691 @@
+# posix_spawn.m4 serial 22
+dnl Copyright (C) 2008-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Tests whether the entire posix_spawn facility is available.
+AC_DEFUN([gl_POSIX_SPAWN],
+[
+ AC_REQUIRE([gl_POSIX_SPAWN_BODY])
+])
+
+AC_DEFUN([gl_POSIX_SPAWN_BODY],
+[
+ AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
+ AC_REQUIRE([gl_HAVE_POSIX_SPAWN])
+ dnl Assume that when the main function exists, all the others,
+ dnl except posix_spawnattr_{get,set}sched*, are available as well.
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnp])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_init])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addclose])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_adddup2])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addopen])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_destroy])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_init])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getflags])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setflags])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getpgroup])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setpgroup])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getsigdefault])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setsigdefault])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getsigmask])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setsigmask])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_destroy])
+ AC_CHECK_DECLS([posix_spawn], , , [[#include <spawn.h>]])
+ if test $ac_cv_func_posix_spawn = yes; then
+ m4_ifdef([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR],
+ [dnl Module 'posix_spawn_file_actions_addchdir' is present.
+ AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addchdir_np])
+ if test $ac_cv_func_posix_spawn_file_actions_addchdir_np = no; then
+ dnl In order to implement the posix_spawn_file_actions_addchdir
+ dnl function, we need to replace the entire posix_spawn facility.
+ REPLACE_POSIX_SPAWN=1
+ fi
+ ])
+ m4_ifdef([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDFCHDIR],
+ [dnl Module 'posix_spawn_file_actions_addfchdir' is present.
+ AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addfchdir_np])
+ if test $ac_cv_func_posix_spawn_file_actions_addfchdir_np = no; then
+ dnl In order to implement the posix_spawn_file_actions_addfchdir
+ dnl function, we need to replace the entire posix_spawn facility.
+ REPLACE_POSIX_SPAWN=1
+ fi
+ ])
+ if test $REPLACE_POSIX_SPAWN = 0; then
+ gl_POSIX_SPAWN_WORKS
+ case "$gl_cv_func_posix_spawn_works" in
+ *yes) ;;
+ *) REPLACE_POSIX_SPAWN=1 ;;
+ esac
+ fi
+ if test $REPLACE_POSIX_SPAWN = 0; then
+ gl_POSIX_SPAWN_SECURE
+ case "$gl_cv_func_posix_spawn_secure_exec" in
+ *yes) ;;
+ *) REPLACE_POSIX_SPAWN=1 ;;
+ esac
+ case "$gl_cv_func_posix_spawnp_secure_exec" in
+ *yes) ;;
+ *) REPLACE_POSIX_SPAWN=1 ;;
+ esac
+ fi
+ if test $REPLACE_POSIX_SPAWN = 0; then
+ dnl Assume that these functions are available if POSIX_SPAWN_SETSCHEDULER
+ dnl evaluates to nonzero.
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getschedpolicy])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setschedpolicy])
+ AC_CACHE_CHECK([whether posix_spawnattr_setschedpolicy is supported],
+ [gl_cv_func_spawnattr_setschedpolicy],
+ [AC_EGREP_CPP([POSIX scheduling supported], [
+#include <spawn.h>
+#if POSIX_SPAWN_SETSCHEDULER
+ POSIX scheduling supported
+#endif
+],
+ [gl_cv_func_spawnattr_setschedpolicy=yes],
+ [gl_cv_func_spawnattr_setschedpolicy=no])
+ ])
+ dnl Assume that these functions are available if POSIX_SPAWN_SETSCHEDPARAM
+ dnl evaluates to nonzero.
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getschedparam])
+ dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setschedparam])
+ AC_CACHE_CHECK([whether posix_spawnattr_setschedparam is supported],
+ [gl_cv_func_spawnattr_setschedparam],
+ [AC_EGREP_CPP([POSIX scheduling supported], [
+#include <spawn.h>
+#if POSIX_SPAWN_SETSCHEDPARAM
+ POSIX scheduling supported
+#endif
+],
+ [gl_cv_func_spawnattr_setschedparam=yes],
+ [gl_cv_func_spawnattr_setschedparam=no])
+ ])
+ fi
+ else
+ dnl The system does not have the main function. Therefore we have to
+ dnl provide our own implementation. This implies to define our own
+ dnl posix_spawn_file_actions_t and posix_spawnattr_t types.
+ if test $ac_cv_have_decl_posix_spawn = yes; then
+ dnl The system declares posix_spawn() already. This declaration uses
+ dnl the original posix_spawn_file_actions_t and posix_spawnattr_t types.
+ dnl But we need a declaration with our own posix_spawn_file_actions_t and
+ dnl posix_spawnattr_t types.
+ REPLACE_POSIX_SPAWN=1
+ fi
+ fi
+ if test $ac_cv_func_posix_spawn != yes || test $REPLACE_POSIX_SPAWN = 1; then
+ AC_DEFINE([REPLACE_POSIX_SPAWN], [1],
+ [Define if gnulib uses its own posix_spawn and posix_spawnp functions.])
+ fi
+])
+
+dnl Test whether posix_spawn actually works.
+dnl posix_spawn on AIX 5.3..6.1 has two bugs:
+dnl 1) When it fails to execute the program, the child process exits with
+dnl exit() rather than _exit(), which causes the stdio buffers to be
+dnl flushed. Reported by Rainer Tammer.
+dnl 2) The posix_spawn_file_actions_addopen function does not support file
+dnl names that contain a '*'.
+dnl posix_spawn on AIX 5.3..6.1 has also a third bug: It does not work
+dnl when POSIX threads are used. But we don't test against this bug here.
+AC_DEFUN([gl_POSIX_SPAWN_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether posix_spawn works], [gl_cv_func_posix_spawn_works],
+ [if test $cross_compiling = no; then
+ AC_LINK_IFELSE([AC_LANG_SOURCE([[
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <spawn.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+]GL_MDA_DEFINES[
+
+extern char **environ;
+
+#ifndef STDIN_FILENO
+# define STDIN_FILENO 0
+#endif
+#ifndef STDOUT_FILENO
+# define STDOUT_FILENO 1
+#endif
+#ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+#endif
+
+#ifndef WTERMSIG
+# define WTERMSIG(x) ((x) & 0x7f)
+#endif
+#ifndef WIFEXITED
+# define WIFEXITED(x) (WTERMSIG (x) == 0)
+#endif
+#ifndef WEXITSTATUS
+# define WEXITSTATUS(x) (((x) >> 8) & 0xff)
+#endif
+
+#define CHILD_PROGRAM_FILENAME "/non/exist/ent"
+
+static int
+fd_safer (int fd)
+{
+ if (0 <= fd && fd <= 2)
+ {
+ int f = fd_safer (dup (fd));
+ int e = errno;
+ close (fd);
+ errno = e;
+ fd = f;
+ }
+
+ return fd;
+}
+
+int
+main ()
+{
+ char *argv[2] = { CHILD_PROGRAM_FILENAME, NULL };
+ int ofd[2];
+ sigset_t blocked_signals;
+ sigset_t fatal_signal_set;
+ posix_spawn_file_actions_t actions;
+ bool actions_allocated;
+ posix_spawnattr_t attrs;
+ bool attrs_allocated;
+ int err;
+ pid_t child;
+ int status;
+ int exitstatus;
+
+ setvbuf (stdout, NULL, _IOFBF, 0);
+ puts ("This should be seen only once.");
+ if (pipe (ofd) < 0 || (ofd[1] = fd_safer (ofd[1])) < 0)
+ {
+ perror ("cannot create pipe");
+ exit (1);
+ }
+ sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
+ sigemptyset (&fatal_signal_set);
+ sigaddset (&fatal_signal_set, SIGINT);
+ sigaddset (&fatal_signal_set, SIGTERM);
+ sigaddset (&fatal_signal_set, SIGHUP);
+ sigaddset (&fatal_signal_set, SIGPIPE);
+ sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
+ actions_allocated = false;
+ attrs_allocated = false;
+ if ((err = posix_spawn_file_actions_init (&actions)) != 0
+ || (actions_allocated = true,
+ (err = posix_spawn_file_actions_adddup2 (&actions, ofd[0], STDIN_FILENO)) != 0
+ || (err = posix_spawn_file_actions_addclose (&actions, ofd[0])) != 0
+ || (err = posix_spawn_file_actions_addclose (&actions, ofd[1])) != 0
+ || (err = posix_spawnattr_init (&attrs)) != 0
+ || (attrs_allocated = true,
+ (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
+ || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0)
+ || (err = posix_spawnp (&child, CHILD_PROGRAM_FILENAME, &actions, &attrs, argv, environ)) != 0))
+ {
+ if (actions_allocated)
+ posix_spawn_file_actions_destroy (&actions);
+ if (attrs_allocated)
+ posix_spawnattr_destroy (&attrs);
+ sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
+ if (err == ENOENT)
+ return 0;
+ else
+ {
+ errno = err;
+ perror ("subprocess failed");
+ exit (1);
+ }
+ }
+ posix_spawn_file_actions_destroy (&actions);
+ posix_spawnattr_destroy (&attrs);
+ sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
+ close (ofd[0]);
+ close (ofd[1]);
+ status = 0;
+ while (waitpid (child, &status, 0) != child)
+ ;
+ if (!WIFEXITED (status))
+ {
+ fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
+ exit (1);
+ }
+ exitstatus = WEXITSTATUS (status);
+ if (exitstatus != 127)
+ {
+ fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
+ exit (1);
+ }
+ return 0;
+}
+]])],
+ [if test -s conftest$ac_exeext \
+ && ./conftest$ac_exeext > conftest.out \
+ && echo 'This should be seen only once.' > conftest.ok \
+ && cmp conftest.out conftest.ok >/dev/null 2>&1; then
+ gl_cv_func_posix_spawn_works=yes
+ else
+ gl_cv_func_posix_spawn_works=no
+ fi],
+ [gl_cv_func_posix_spawn_works=no])
+ if test $gl_cv_func_posix_spawn_works = yes; then
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+/* Test whether posix_spawn_file_actions_addopen supports filename arguments
+ that contain special characters such as '*'. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <spawn.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+]GL_MDA_DEFINES[
+
+extern char **environ;
+
+#ifndef STDIN_FILENO
+# define STDIN_FILENO 0
+#endif
+#ifndef STDOUT_FILENO
+# define STDOUT_FILENO 1
+#endif
+#ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+#endif
+
+#ifndef WTERMSIG
+# define WTERMSIG(x) ((x) & 0x7f)
+#endif
+#ifndef WIFEXITED
+# define WIFEXITED(x) (WTERMSIG (x) == 0)
+#endif
+#ifndef WEXITSTATUS
+# define WEXITSTATUS(x) (((x) >> 8) & 0xff)
+#endif
+
+#define CHILD_PROGRAM_FILENAME "conftest"
+#define DATA_FILENAME "conftest%=*#?"
+
+static int
+parent_main (void)
+{
+ FILE *fp;
+ char *argv[3] = { CHILD_PROGRAM_FILENAME, "-child", NULL };
+ posix_spawn_file_actions_t actions;
+ bool actions_allocated;
+ int err;
+ pid_t child;
+ int status;
+ int exitstatus;
+
+ /* Create a data file with specific contents. */
+ fp = fopen (DATA_FILENAME, "wb");
+ if (fp == NULL)
+ {
+ perror ("cannot create data file");
+ return 1;
+ }
+ fwrite ("Halle Potta", 1, 11, fp);
+ if (fflush (fp) || fclose (fp))
+ {
+ perror ("cannot prepare data file");
+ return 2;
+ }
+
+ /* Avoid reading from our stdin, as it could block. */
+ freopen ("/dev/null", "rb", stdin);
+
+ /* Test whether posix_spawn_file_actions_addopen with this file name
+ actually works, but spawning a child that reads from this file. */
+ actions_allocated = false;
+ if ((err = posix_spawn_file_actions_init (&actions)) != 0
+ || (actions_allocated = true,
+ (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, DATA_FILENAME, O_RDONLY, 0600)) != 0
+ || (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0))
+ {
+ if (actions_allocated)
+ posix_spawn_file_actions_destroy (&actions);
+ errno = err;
+ perror ("subprocess failed");
+ return 3;
+ }
+ posix_spawn_file_actions_destroy (&actions);
+ status = 0;
+ while (waitpid (child, &status, 0) != child)
+ ;
+ if (!WIFEXITED (status))
+ {
+ fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
+ return 4;
+ }
+ exitstatus = WEXITSTATUS (status);
+ if (exitstatus != 0)
+ {
+ fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
+ return 5;
+ }
+ return 0;
+}
+
+static int
+child_main (void)
+{
+ char buf[1024];
+
+ /* See if reading from STDIN_FILENO yields the expected contents. */
+ if (fread (buf, 1, sizeof (buf), stdin) == 11
+ && memcmp (buf, "Halle Potta", 11) == 0)
+ return 0;
+ else
+ return 8;
+}
+
+static void
+cleanup_then_die (int sig)
+{
+ /* Clean up data file. */
+ unlink (DATA_FILENAME);
+
+ /* Re-raise the signal and die from it. */
+ signal (sig, SIG_DFL);
+ raise (sig);
+}
+
+int
+main (int argc, char *argv[])
+{
+ int exitstatus;
+
+ if (!(argc > 1 && strcmp (argv[1], "-child") == 0))
+ {
+ /* This is the parent process. */
+ signal (SIGINT, cleanup_then_die);
+ signal (SIGTERM, cleanup_then_die);
+ #ifdef SIGHUP
+ signal (SIGHUP, cleanup_then_die);
+ #endif
+
+ exitstatus = parent_main ();
+ }
+ else
+ {
+ /* This is the child process. */
+
+ exitstatus = child_main ();
+ }
+ unlink (DATA_FILENAME);
+ return exitstatus;
+}
+]])],
+ [],
+ [gl_cv_func_posix_spawn_works=no])
+ fi
+ else
+ case "$host_os" in
+ aix*) gl_cv_func_posix_spawn_works="guessing no";;
+ *) gl_cv_func_posix_spawn_works="guessing yes";;
+ esac
+ fi
+ ])
+])
+
+dnl Test whether posix_spawn and posix_spawnp are secure.
+AC_DEFUN([gl_POSIX_SPAWN_SECURE],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ dnl On many platforms, posix_spawn or posix_spawnp allow executing a
+ dnl script without a '#!' marker as a shell script. This is unsecure.
+ AC_CACHE_CHECK([whether posix_spawn rejects scripts without shebang],
+ [gl_cv_func_posix_spawn_secure_exec],
+ [echo ':' > conftest.scr
+ chmod a+x conftest.scr
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ #include <errno.h>
+ #include <spawn.h>
+ #include <stddef.h>
+ #include <sys/types.h>
+ #include <sys/wait.h>
+ int
+ main ()
+ {
+ const char *prog_path = "./conftest.scr";
+ const char *prog_argv[2] = { prog_path, NULL };
+ const char *environment[2] = { "PATH=.", NULL };
+ pid_t child;
+ int status;
+ int err = posix_spawn (&child, prog_path, NULL, NULL,
+ (char **) prog_argv, (char **) environment);
+ if (err == ENOEXEC)
+ return 0;
+ if (err != 0)
+ return 1;
+ status = 0;
+ while (waitpid (child, &status, 0) != child)
+ ;
+ if (!WIFEXITED (status))
+ return 2;
+ if (WEXITSTATUS (status) != 127)
+ return 3;
+ return 0;
+ }
+ ]])],
+ [gl_cv_func_posix_spawn_secure_exec=yes],
+ [gl_cv_func_posix_spawn_secure_exec=no],
+ [case "$host_os" in
+ # Guess no on GNU/Hurd.
+ gnu*)
+ gl_cv_func_posix_spawn_secure_exec="guessing no" ;;
+ # Guess yes on all other platforms.
+ *)
+ gl_cv_func_posix_spawn_secure_exec="guessing yes" ;;
+ esac
+ ])
+ rm -f conftest.scr
+ ])
+ AC_CACHE_CHECK([whether posix_spawnp rejects scripts without shebang],
+ [gl_cv_func_posix_spawnp_secure_exec],
+ [echo ':' > conftest.scr
+ chmod a+x conftest.scr
+ AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ #include <errno.h>
+ #include <spawn.h>
+ #include <stddef.h>
+ #include <sys/types.h>
+ #include <sys/wait.h>
+ int
+ main ()
+ {
+ const char *prog_path = "./conftest.scr";
+ const char *prog_argv[2] = { prog_path, NULL };
+ const char *environment[2] = { "PATH=.", NULL };
+ pid_t child;
+ int status;
+ int err = posix_spawnp (&child, prog_path, NULL, NULL,
+ (char **) prog_argv, (char **) environment);
+ if (err == ENOEXEC)
+ return 0;
+ if (err != 0)
+ return 1;
+ status = 0;
+ while (waitpid (child, &status, 0) != child)
+ ;
+ if (!WIFEXITED (status))
+ return 2;
+ if (WEXITSTATUS (status) != 127)
+ return 3;
+ return 0;
+ }
+ ]])],
+ [gl_cv_func_posix_spawnp_secure_exec=yes],
+ [gl_cv_func_posix_spawnp_secure_exec=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems (glibc >= 2.15 actually) except GNU/Hurd,
+ # musl libc, NetBSD.
+ *-gnu* | *-musl* | netbsd*)
+ gl_cv_func_posix_spawnp_secure_exec="guessing yes" ;;
+ # Guess no on GNU/Hurd, macOS, FreeBSD, OpenBSD, AIX, Solaris, Cygwin.
+ gnu* | darwin* | freebsd* | dragonfly* | midnightbsd* | openbsd* | \
+ aix* | solaris* | cygwin*)
+ gl_cv_func_posix_spawnp_secure_exec="guessing no" ;;
+ # If we don't know, obey --enable-cross-guesses.
+ *)
+ gl_cv_func_posix_spawnp_secure_exec="$gl_cross_guess_normal" ;;
+ esac
+ ])
+ rm -f conftest.scr
+ ])
+])
+
+# Prerequisites of lib/spawni.c.
+AC_DEFUN([gl_PREREQ_POSIX_SPAWN_INTERNAL],
+[
+ AC_CHECK_HEADERS([paths.h])
+ AC_CHECK_FUNCS([confstr sched_setparam sched_setscheduler setegid seteuid vfork])
+])
+
+AC_DEFUN([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE],
+[
+ AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ gl_POSIX_SPAWN
+ if test $REPLACE_POSIX_SPAWN = 1; then
+ REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE=1
+ else
+ dnl On musl libc, posix_spawn_file_actions_addclose succeeds even if the fd
+ dnl argument is negative.
+ AC_CACHE_CHECK([whether posix_spawn_file_actions_addclose works],
+ [gl_cv_func_posix_spawn_file_actions_addclose_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <spawn.h>
+int main ()
+{
+ posix_spawn_file_actions_t actions;
+ if (posix_spawn_file_actions_init (&actions) != 0)
+ return 1;
+ if (posix_spawn_file_actions_addclose (&actions, -5) == 0)
+ return 2;
+ return 0;
+}]])],
+ [gl_cv_func_posix_spawn_file_actions_addclose_works=yes],
+ [gl_cv_func_posix_spawn_file_actions_addclose_works=no],
+ [# Guess no on musl libc and Solaris, yes otherwise.
+ case "$host_os" in
+ *-musl*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
+ solaris*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
+ # Guess no on native Windows.
+ mingw*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
+ *) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing yes" ;;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_posix_spawn_file_actions_addclose_works" in
+ *yes) ;;
+ *) REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE=1 ;;
+ esac
+ fi
+])
+
+AC_DEFUN([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2],
+[
+ AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ gl_POSIX_SPAWN
+ if test $REPLACE_POSIX_SPAWN = 1; then
+ REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2=1
+ else
+ dnl On musl libc and Solaris 11.0, posix_spawn_file_actions_adddup2
+ dnl succeeds even if the fd argument is out of range.
+ AC_CACHE_CHECK([whether posix_spawn_file_actions_adddup2 works],
+ [gl_cv_func_posix_spawn_file_actions_adddup2_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <spawn.h>
+int main ()
+{
+ posix_spawn_file_actions_t actions;
+ if (posix_spawn_file_actions_init (&actions) != 0)
+ return 1;
+ if (posix_spawn_file_actions_adddup2 (&actions, 10000000, 2) == 0)
+ return 2;
+ return 0;
+}]])],
+ [gl_cv_func_posix_spawn_file_actions_adddup2_works=yes],
+ [gl_cv_func_posix_spawn_file_actions_adddup2_works=no],
+ [# Guess no on musl libc and Solaris, yes otherwise.
+ case "$host_os" in
+ *-musl*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";;
+ solaris*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";;
+ # Guess no on native Windows.
+ mingw*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no" ;;
+ *) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing yes";;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_posix_spawn_file_actions_adddup2_works" in
+ *yes) ;;
+ *) REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2=1 ;;
+ esac
+ fi
+])
+
+AC_DEFUN([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN],
+[
+ AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ gl_POSIX_SPAWN
+ if test $REPLACE_POSIX_SPAWN = 1; then
+ REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN=1
+ else
+ dnl On musl libc and Solaris 11.0, posix_spawn_file_actions_addopen
+ dnl succeeds even if the fd argument is out of range.
+ AC_CACHE_CHECK([whether posix_spawn_file_actions_addopen works],
+ [gl_cv_func_posix_spawn_file_actions_addopen_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <spawn.h>
+#include <fcntl.h>
+int main ()
+{
+ posix_spawn_file_actions_t actions;
+ if (posix_spawn_file_actions_init (&actions) != 0)
+ return 1;
+ if (posix_spawn_file_actions_addopen (&actions, 10000000, "foo", 0, O_RDONLY)
+ == 0)
+ return 2;
+ return 0;
+}]])],
+ [gl_cv_func_posix_spawn_file_actions_addopen_works=yes],
+ [gl_cv_func_posix_spawn_file_actions_addopen_works=no],
+ [# Guess no on musl libc and Solaris, yes otherwise.
+ case "$host_os" in
+ *-musl*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";;
+ solaris*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";;
+ # Guess no on native Windows.
+ mingw*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no" ;;
+ *) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing yes";;
+ esac
+ ])
+ ])
+ case "$gl_cv_func_posix_spawn_file_actions_addopen_works" in
+ *yes) ;;
+ *) REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN=1 ;;
+ esac
+ fi
+])